PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Frame of ReferenceMModule - Frame of Reference
General EquipmentMModule - Equipment
General ImageMModule - Image
General ReferenceUModule - Image
Image PlaneMModule - Image
Image PixelMModule - Image
Contrast/BolusCModule - Image
DeviceUModule - Image
SpecimenUModule - Image
CT ImageMModule - Image
(0008,0008) Image Type1Code String
(0008,2218) Anatomic Region Sequence3Sequence
(0008,2228) Primary Anatomic Structure Sequence3Sequence
(0018,0022) Scan Options3Code String
(0018,0060) KVP2Decimal String
(0018,0090) Data Collection Diameter3Decimal String
(0018,1100) Reconstruction Diameter3Decimal String
(0018,1110) Distance Source to Detector3Decimal String
(0018,1111) Distance Source to Patient3Decimal String
(0018,1120) Gantry/Detector Tilt3Decimal String
(0018,1130) Table Height3Decimal String
(0018,1140) Rotation Direction3Code String
(0018,1150) Exposure Time3Integer String
(0018,1151) X-Ray Tube Current3Integer String
(0018,1152) Exposure3Integer String
(0018,1153) Exposure in µAs3Integer String
(0018,115E) Image and Fluoroscopy Area Dose Product3Decimal String
(0018,1160) Filter Type3Short String
(0018,1170) Generator Power3Integer String
(0018,1190) Focal Spot(s)3Decimal String
(0018,1210) Convolution Kernel3Short String
(0018,1271) Water Equivalent Diameter3Double
(0018,1272) Water Equivalent Diameter Calculation Method Code Sequence1CSequence
(0018,9305) Revolution Time3Double
(0018,9306) Single Collimation Width3Double
(0018,9307) Total Collimation Width3Double
(0018,9309) Table Speed3Double
(0018,9310) Table Feed per Rotation3Double
(0018,9311) Spiral Pitch Factor3Double
(0018,9313) Data Collection Center (Patient)3Double
(0018,9318) Reconstruction Target Center (Patient)3Double
(0018,9323) Exposure Modulation Type3Code String
(0018,9324) Estimated Dose Saving3Double
(0018,9345) CTDIvol3Double
(0018,9346) CTDI Phantom Type Code Sequence3Sequence
(0018,9351) Calcium Scoring Mass Factor Patient3Single
(0018,9352) Calcium Scoring Mass Factor Device3Single
(0018,9353) Energy Weighting Factor1CSingle
(0018,9360) CT Additional X-Ray Source Sequence3Sequence
(0018,9361) Multi-energy CT Acquisition3Code String
(0020,0012) Acquisition Number2Integer String
(0028,0002) Samples per Pixel1Unsigned Short
(0028,0004) Photometric Interpretation1Code String
(0028,0100) Bits Allocated1Unsigned Short
(0028,0101) Bits Stored1Unsigned Short
(0028,0102) High Bit1Unsigned Short
(0028,1052) Rescale Intercept1Decimal String
(0028,1053) Rescale Slope1Decimal String
(0028,1054) Rescale Type1CLong String
(0054,0220) View Code Sequence3Sequence
(0054,0500) Slice Progression Direction3Code String
(300A,0122) Patient Support Angle3Decimal String
(300A,0129) Table Top Longitudinal Position3Decimal String
(300A,012A) Table Top Lateral Position3Decimal String
(300A,012C) Isocenter Position3Decimal String
(300A,0140) Table Top Pitch Angle3Single
(300A,0144) Table Top Roll Angle3Single
Multi-energy CT ImageCModule - Image
Overlay PlaneUModule - Image
VOI LUTUModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
US Multi-frame ImageCIOD
Secondary Capture ImageCIOD
Multi-frame Single Bit SC ImageCIOD
Multi-frame Grayscale Byte SC ImageCIOD
Multi-frame Grayscale Word SC ImageCIOD
Multi-frame True Color SC ImageCIOD
X-Ray Angiographic ImageCIOD
X-Ray Radiofluoroscopic ImageCIOD
RT Structure SetCIOD
Digital X-Ray ImageCIOD
Digital Mammography X-Ray ImageCIOD
Digital Intra-Oral X-Ray ImageCIOD
RT Beams Treatment RecordCIOD
RT Brachy Treatment RecordCIOD
RT Treatment Summary RecordCIOD
VL Endoscopic ImageCIOD
VL Microscopic ImageCIOD
VL Slide-Coordinates Microscopic ImageCIOD
VL Photographic ImageCIOD
Video Endoscopic ImageCIOD
Video Microscopic ImageCIOD
Video Photographic ImageCIOD
VL Whole Slide Microscopy ImageCIOD
Real-Time Video Endoscopic ImageCIOD
Real-Time Video Photographic ImageCIOD
Grayscale Softcopy Presentation StateCIOD
Color Softcopy Presentation StateCIOD
Pseudo-Color Softcopy Presentation StateCIOD
Blending Softcopy Presentation StateCIOD
Basic Structured DisplayCIOD
XA/XRF Grayscale Softcopy Presentation StateCIOD
Advanced Blending Presentation StateCIOD
Basic Voice Audio WaveformCIOD
Ambulatory ECGCIOD
Hemodynamic WaveformCIOD
Basic Cardiac Electrophysiology WaveformCIOD
Arterial Pulse WaveformCIOD
Respiratory WaveformCIOD
General Audio WaveformCIOD
Real-Time Audio WaveformCIOD
Basic Text SRCIOD
Enhanced SRCIOD
Comprehensive SRCIOD
Key Object Selection DocumentCIOD
Mammography CAD SRCIOD
Procedure LogCIOD
X-Ray Radiation Dose SRCIOD
Spectacle Prescription ReportCIOD
Macular Grid Thickness and Volume ReportCIOD
Implantation Plan SR DocumentCIOD
Comprehensive 3D SRCIOD
Radiopharmaceutical Radiation Dose SRCIOD
Extensible SRCIOD
Acquisition Context SRCIOD
Simplified Adult Echo SRCIOD
Patient Radiation Dose Structured ReportCIOD
Planned Imaging Agent Administration SRCIOD
Performed Imaging Agent Administration SRCIOD
Rendition Selection DocumentCIOD
Enhanced MR ImageCIOD
MR SpectroscopyCIOD
Enhanced MR Color ImageCIOD
Raw DataCIOD
Enhanced CT ImageCIOD
Spatial RegistrationCIOD
Deformable Spatial RegistrationCIOD
Spatial FiducialsCIOD
Ophthalmic Photography 8 Bit ImageCIOD
Ophthalmic Photography 16 Bit ImageCIOD
Stereometric RelationshipCIOD
Hanging ProtocolCIOD
Encapsulated PDFCIOD
Encapsulated CDACIOD
Real World Value MappingCIOD
Enhanced XA ImageCIOD
Enhanced XRF ImageCIOD
RT Ion Beams Treatment RecordCIOD
Ophthalmic Tomography ImageCIOD
X-Ray 3D Angiographic ImageCIOD
X-Ray 3D Craniofacial ImageCIOD
Breast Tomosynthesis ImageCIOD
Enhanced PET ImageCIOD
Surface SegmentationCIOD
Color PaletteCIOD
Enhanced US VolumeCIOD
Lensometry MeasurementsCIOD
Autorefraction MeasurementsCIOD
Keratometry MeasurementsCIOD
Subjective Refraction MeasurementsCIOD
Visual Acuity MeasurementsCIOD
Ophthalmic Axial MeasurementsCIOD
Intraocular Lens CalculationsCIOD
Generic Implant TemplateCIOD
Implant Assembly TemplateCIOD
Implant Template GroupCIOD
RT Beams Delivery InstructionCIOD
Ophthalmic Visual Field Static Perimetry MeasurementsCIOD
Intravascular Optical Coherence Tomography ImageCIOD
Ophthalmic Thickness MapCIOD
Surface Scan MeshCIOD
Surface Scan Point CloudCIOD
Legacy Converted Enhanced CT ImageCIOD
Legacy Converted Enhanced MR ImageCIOD
Legacy Converted Enhanced PET ImageCIOD
Corneal Topography MapCIOD
Breast Projection X-Ray ImageCIOD
Parametric MapCIOD
Wide Field Ophthalmic Photography Stereographic Projection ImageCIOD
Wide Field Ophthalmic Photography 3D Coordinates ImageCIOD
Tractography ResultsCIOD
RT Brachy Application Setup Delivery InstructionCIOD
Planar MPR Volumetric Presentation StateCIOD
Volume Rendering Volumetric Presentation StateCIOD
Content Assessment ResultsCIOD
CT Performed Procedure ProtocolCIOD
CT Defined Procedure ProtocolCIOD
Protocol ApprovalCIOD
Ophthalmic Optical Coherence Tomography En Face ImageCIOD
Ophthalmic Optical Coherence Tomography B-scan Volume AnalysisCIOD
Encapsulated STLCIOD
Encapsulated OBJCIOD
Encapsulated MTLCIOD
RT Physician IntentCIOD
RT Segment AnnotationCIOD
RT Radiation SetCIOD
C-Arm Photon-Electron RadiationCIOD
Tomotherapeutic RadiationCIOD
Robotic-Arm RadiationCIOD
Basic DirectoryCIOD

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 12 May 2020. The DICOM Standard is under continuous maintenance, and the current official version is available at DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Exposure Time Attribute

TypeOptional (3)
Value Multiplicity1
Value RepresentationInteger String (IS)
Example Values
  • 500
  • 800
  • 400

Time of X-Ray exposure in msec.

If Acquisition Type (0018,9302) equals SPIRAL, the value of this Attribute shall be Revolution Time (0018,9305) divided by the Spiral Pitch Factor (0018,9311). See Section C. and Section C.

Shall not be present if this Attribute is present in Multi-energy CT Acquisition Sequence (0018,9362) and the value of this Attribute is not the same in all Items of the Multi-energy CT Acquisition Sequence (0018,9362).

Section C.

C. Exposure Time in ms Attribute (Informative)

An example of how the value of Exposure Time in ms (0018,9328) can be calculated:

The Exposure Time Texposuretime of a volume shall be the time of the X-Ray radiation in position with this volume. It depends on the travel speed and the total collimation width.

Texposuretime of the volume represented by a distinguished frame of a Spiral Scan can be calculated as follows:

Texposuretime = N x S / Vtravelspeed

CTpitchfactor = DD / N x S

Vtravelspeed = DD / Trevolutiontime

From this the exposure time can be derived:

Texposuretime = N x S x Trevolutiontime / DD = Trevolutiontime / CTpitchfactor


DD = Table Feed per Rotation (0018,9310) in mm distance moved by the patient support in the z direction per 360° revolution in Spiral scanning

S = collimation of a single slice in mm

N = number slices

N x S = Total Collimation Width (0018,9307) in mm

Vtravelspeed = Table Speed (0018,9309) in mm/second, travel speed of the patient table

Trevolutiontime = Revolution time (0018,9305) in seconds

CTpitchfactor = Spiral Pitch Factor (0018,9311)

Section C.

C. Acquisition Type

Defined Terms:


identifies that the acquisition was performed by acquiring single or multi detector data while rotating the source about the gantry while the table is not moving; additional slices may be acquired by incrementing the table position and again rotating the source about the gantry while the table is not moving


identifies that the acquisition was performed by acquiring data while rotating the source about the gantry while continuously moving the table


identifies that the acquisition was performed by holding the source at a constant angle and moving the table to obtain a projection image (e.g., a localizer image)


identifies that the acquisition was performed by holding the table at a constant position and performing one or more acquisitions over time at the same location


identifies that the acquisition was performed while rotating the source about the gantry while the table movement is under direct control of a human operator or under the control of an analysis application (e.g., fluoroscopic image)